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Facebook's stock declined more than 1 percent in the extended session after the company's third quarter earnings significantly beat analysts' expectations. The social media giant reported surging sales of digital ads, more active users than expected and accelerated revenue. However, Facebook issued a warning on security costs. The company has been under fire for selling ads to Russia-affiliated groups ahead of the 2016 U.S. presidential election.

FireEye's stock dropped nearly 13 percent in extended trading after the cybersecurity company posted an adjusted loss of 4 cents per share for the third quarter. At one point, the stock plunged as much as 15 percent.

Shares of Under Armour slid slightly after the bell. The sportswear company announced that its chief marketing officer and the head of its women's business would leave as Under Armour continues to grapple with declining sales.